/Engine/Source/Runtime/MovieSceneTracks/Public/Systems/MovieSceneMaterialSystem.h
typedef [TPreAnimatedStateStorage](API\Runtime\MovieScene\Evaluation\PreAnimatedState\TPreAnimatedStateStorage)< [TPreAnimatedMaterialTraits](API\Runtime\MovieSceneTracks\Systems\TPreAnimatedMaterialTraits)< AccessorType, RequiredComponents... >> MaterialSwitcherStorageType